1 /* 2 * Copyright (c) 1980, 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char sccsid[] = "@(#)fstab.c 8.1 (Berkeley) 6/4/93"; 32 #endif /* LIBC_SCCS and not lint */ 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include "namespace.h" 37 #include <sys/param.h> 38 #include <sys/mount.h> 39 #include <sys/stat.h> 40 41 #include <errno.h> 42 #include <fstab.h> 43 #include <paths.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <unistd.h> 48 #include "un-namespace.h" 49 50 static FILE *_fs_fp; 51 static struct fstab _fs_fstab; 52 static int LineNo = 0; 53 static char *path_fstab; 54 static char fstab_path[PATH_MAX]; 55 static int fsp_set = 0; 56 57 static void error(int); 58 static void fixfsfile(void); 59 static int fstabscan(void); 60 61 void 62 setfstab(const char *file) 63 { 64 65 if (file == NULL) { 66 path_fstab = _PATH_FSTAB; 67 } else { 68 strncpy(fstab_path, file, PATH_MAX); 69 fstab_path[PATH_MAX - 1] = '\0'; 70 path_fstab = fstab_path; 71 } 72 fsp_set = 1; 73 74 return; 75 } 76 77 const char * 78 getfstab (void) 79 { 80 81 if (fsp_set) 82 return (path_fstab); 83 else 84 return (_PATH_FSTAB); 85 } 86 87 static void 88 fixfsfile() 89 { 90 static char buf[sizeof(_PATH_DEV) + MNAMELEN]; 91 struct stat sb; 92 struct statfs sf; 93 94 if (strcmp(_fs_fstab.fs_file, "/") != 0) 95 return; 96 if (statfs("/", &sf) != 0) 97 return; 98 if (sf.f_mntfromname[0] == '/') 99 buf[0] = '\0'; 100 else 101 strcpy(buf, _PATH_DEV); 102 strcat(buf, sf.f_mntfromname); 103 if (stat(buf, &sb) != 0 || 104 (!S_ISBLK(sb.st_mode) && !S_ISCHR(sb.st_mode))) 105 return; 106 _fs_fstab.fs_spec = buf; 107 } 108 109 static int 110 fstabscan() 111 { 112 char *cp, *p; 113 #define MAXLINELENGTH 1024 114 static char line[MAXLINELENGTH]; 115 char subline[MAXLINELENGTH]; 116 int typexx; 117 118 for (;;) { 119 120 if (!(p = fgets(line, sizeof(line), _fs_fp))) 121 return(0); 122 /* OLD_STYLE_FSTAB */ 123 ++LineNo; 124 if (*line == '#' || *line == '\n') 125 continue; 126 if (!strpbrk(p, " \t")) { 127 _fs_fstab.fs_spec = strsep(&p, ":\n"); 128 _fs_fstab.fs_file = strsep(&p, ":\n"); 129 fixfsfile(); 130 _fs_fstab.fs_type = strsep(&p, ":\n"); 131 if (_fs_fstab.fs_type) { 132 if (!strcmp(_fs_fstab.fs_type, FSTAB_XX)) 133 continue; 134 _fs_fstab.fs_mntops = _fs_fstab.fs_type; 135 _fs_fstab.fs_vfstype = 136 strcmp(_fs_fstab.fs_type, FSTAB_SW) ? 137 "ufs" : "swap"; 138 if ((cp = strsep(&p, ":\n")) != NULL) { 139 _fs_fstab.fs_freq = atoi(cp); 140 if ((cp = strsep(&p, ":\n")) != NULL) { 141 _fs_fstab.fs_passno = atoi(cp); 142 return(1); 143 } 144 } 145 } 146 goto bad; 147 } 148 /* OLD_STYLE_FSTAB */ 149 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 150 ; 151 _fs_fstab.fs_spec = cp; 152 if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#') 153 continue; 154 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 155 ; 156 _fs_fstab.fs_file = cp; 157 fixfsfile(); 158 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 159 ; 160 _fs_fstab.fs_vfstype = cp; 161 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 162 ; 163 _fs_fstab.fs_mntops = cp; 164 if (_fs_fstab.fs_mntops == NULL) 165 goto bad; 166 _fs_fstab.fs_freq = 0; 167 _fs_fstab.fs_passno = 0; 168 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 169 ; 170 if (cp != NULL) { 171 _fs_fstab.fs_freq = atoi(cp); 172 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 173 ; 174 if (cp != NULL) 175 _fs_fstab.fs_passno = atoi(cp); 176 } 177 strcpy(subline, _fs_fstab.fs_mntops); 178 p = subline; 179 for (typexx = 0, cp = strsep(&p, ","); cp; 180 cp = strsep(&p, ",")) { 181 if (strlen(cp) != 2) 182 continue; 183 if (!strcmp(cp, FSTAB_RW)) { 184 _fs_fstab.fs_type = FSTAB_RW; 185 break; 186 } 187 if (!strcmp(cp, FSTAB_RQ)) { 188 _fs_fstab.fs_type = FSTAB_RQ; 189 break; 190 } 191 if (!strcmp(cp, FSTAB_RO)) { 192 _fs_fstab.fs_type = FSTAB_RO; 193 break; 194 } 195 if (!strcmp(cp, FSTAB_SW)) { 196 _fs_fstab.fs_type = FSTAB_SW; 197 break; 198 } 199 if (!strcmp(cp, FSTAB_XX)) { 200 _fs_fstab.fs_type = FSTAB_XX; 201 typexx++; 202 break; 203 } 204 } 205 if (typexx) 206 continue; 207 if (cp != NULL) 208 return(1); 209 210 bad: /* no way to distinguish between EOF and syntax error */ 211 error(EFTYPE); 212 } 213 /* NOTREACHED */ 214 } 215 216 struct fstab * 217 getfsent() 218 { 219 if ((!_fs_fp && !setfsent()) || !fstabscan()) 220 return((struct fstab *)NULL); 221 return(&_fs_fstab); 222 } 223 224 struct fstab * 225 getfsspec(name) 226 const char *name; 227 { 228 if (setfsent()) 229 while (fstabscan()) 230 if (!strcmp(_fs_fstab.fs_spec, name)) 231 return(&_fs_fstab); 232 return((struct fstab *)NULL); 233 } 234 235 struct fstab * 236 getfsfile(name) 237 const char *name; 238 { 239 if (setfsent()) 240 while (fstabscan()) 241 if (!strcmp(_fs_fstab.fs_file, name)) 242 return(&_fs_fstab); 243 return((struct fstab *)NULL); 244 } 245 246 int 247 setfsent() 248 { 249 if (_fs_fp) { 250 rewind(_fs_fp); 251 LineNo = 0; 252 return(1); 253 } 254 if (fsp_set == 0) { 255 if (issetugid()) 256 setfstab(NULL); 257 else 258 setfstab(getenv("PATH_FSTAB")); 259 } 260 if ((_fs_fp = fopen(path_fstab, "r")) != NULL) { 261 LineNo = 0; 262 return(1); 263 } 264 error(errno); 265 return(0); 266 } 267 268 void 269 endfsent() 270 { 271 if (_fs_fp) { 272 (void)fclose(_fs_fp); 273 _fs_fp = NULL; 274 } 275 276 fsp_set = 0; 277 } 278 279 static void 280 error(err) 281 int err; 282 { 283 char *p; 284 char num[30]; 285 286 (void)_write(STDERR_FILENO, "fstab: ", 7); 287 (void)_write(STDERR_FILENO, path_fstab, strlen(path_fstab)); 288 (void)_write(STDERR_FILENO, ":", 1); 289 sprintf(num, "%d: ", LineNo); 290 (void)_write(STDERR_FILENO, num, strlen(num)); 291 p = strerror(err); 292 (void)_write(STDERR_FILENO, p, strlen(p)); 293 (void)_write(STDERR_FILENO, "\n", 1); 294 } 295